Dough-mixing machine.



0. CHAMBERS, JR. DOUGH MIXING MACHINE. 7 APPLICATION FILED OCT. 4, 1905939,392 Patented Nov. 9, 1909.

4 SHEETS-SHEET 1.

f it:

. wmvsssrs;

4 ITTOH/(El.

U. CHAMBERS, JR. DOUGH MIXING MACHINE. APPLICATION FILED 00124, 1905.

Patented Nov. 9, 1909.

QSHEETS-SHBET 2.

l aei 4 ooooooooo uoo' op 00 o o'oo'o oo oo 0 o 0e: o c 0 000000 000 a000 00000 no 000000 WITNESSES ATTORNEY.

0. CHAMBERS, JR. DOUGH MIXING MACHINE. AiPLIOATION ruin) 0014, 1905.

Patented Nov. 9, 1909.

4 SHEETSSKEET 3.

19w W 0 vww 3 \k n a 3 J m M MW v WCM m m w 1 *n N a & N mm? J? 2551oo-r e 3w Y b QM I JK. I w K b5 H m w I um e ww 4m, -iw N R. N N Q m w UYLeQW m N n O G Qfig G. CHAMBERS, JR. DOUGH MIXING MAGHINB: APPLICATIONFILED 001'. 4, 1905.

Patented Nov. 9, 1909.

4SHEETS-SHEET 4.

m, M ATTORNEY.

00 I 00 v. OO- B w 0 m WI TIMES-9E5 To all whom itwiay concern:

UNITED STATES PATENT OFFICE.

cymrs CHAMBERS, an, or ovnmmoox, PENNSYLVANIA.

' noueraivnxrne MACHINE.

Be it known thatI, CYRUs CHAMBERS, J r., a citizen of the United States,residing at 'Overbrook, in the county of Montgomeryand State ofPennsylvania, have invented a new and useful Dough-Mixin Machine, ofwhich the fol-lowin 1s a ,speci cation.

' My inventionre ates toimprovements in machines for. mixing dough, andcomprises means whereby fiour is sifted lightly and automatically intothe liquid, such as yeast, milk and water, means whereby the siftedflour is drawn lightly and without material pressurethrough the liquid,and means whereby the mixture is then aerated by being pulled apart inthe air above the liquid.

'By this operation the flour particles are each completely .enveloped inmoisture, and

held in light contact with one another so that theyv may fully expandand develop.

My invention comprises improvements. in

the device described in patent to L. C.

Sharpless N 0. 710,619 dated Oct. 7, 1902. I

My object has been to reduce the cost of manufacture of the machine; toimprove its to prevent waste of flour; to provide means whereby themachine may be ,quickly and easily taken apart and put together; toprovide means whereby the machine may not be put together wrongly; v toprovide means whereby. the machine may be readily cleaned and whereby itmay be made strictly sani tary; to provide means whereby the requiredwork of the machine maybe performed in the least possible time wherebyan improved quality of bread is produced at minimum labor. 7

. My invention comprises means connected with the bottom of the airchamber for preventing endwise movement thereof; the re duction of thediameters of the shafts with respect to the width of the blades; therelatively increased diameter of each shaft at "leak of material betweenthe shafts and their journal boxes; means at the ends of the shaftsdistant from the gear end to secure their proper positioning; means forsecuring the proper relative association of the gear wheels; improvedmeans for adjusting the position of the thermometer; and means connectedwlth the supporting feet for pro- Specification of Letters Patent.Application filed October 4, 1905. Serial No. 281,256.

Patented Nov. 9, 1909.

ducing a yielding, frictional contact with the surface upon which themachine may rest, said tread having such characteristic that it will beslightly elastic, fire proof, impervious to water, andnonshrinkable withage.

Referring to the drawings i.Figure, 1 is an elevation of my device. Fig.2 is a crosssection on line 2, 2 of Fig. 1. Fig 3is a plan view of' thebasin with the superimposing structurc removed. Fig. l is aplan view ofthe sifter. Fi 5 is a longitudinal vertical section on line 5.,5 of Fig.4,..the middle portion being broken away to economize space. Fig. 6 is aside elevation of the spring catch. Fig. 7 is a horizontal section ofthe thermometer shield and fastener. Fig. 8 is an elevation of theconnecting rod catch. Fig. 9 is a vertical section on line 9', 9 of Fig.8. Fig. 10 is a right hand e'nd elevation. Fig. 11 is a left hand endelevation. Fig. 12 is a perspective view of the thermometer calibratingdevice. Fig. 13 is a section of sifter shaft through yoke slot.

Fig. 14; is a fragmentary vertical sectional tary view of the interior.end elevation of' sifter hopper. Fig. 16 is a fragmentary Fig. 17 is asectional view of the spring catch in the preliminary locking position.Fig. 18 is a fragmentary view of the gear end of a mixing shaft. Fig. 19is an end elevation of Fig. 18. I

Similar numerals refer to similar parts throughout the several views.

My device comprises the basin portion 1 with the air chamber portion 2detachably connected therewith. The air chamber portion 2 is open at thetop and is adapted to have seated in said opening the sifting ho per 3'.Between the basin 1 and the air chamber member 2 are located. thejournal boxes for the shafts 4 and 5, provided with the sets of mixinblades 6 and 7 respectively. These sha tsare connected with thecooperating gears 8 and 9, operated by the handle or winch 10, so thatsaid shafts will be rotated in opposite directions as indiview of oneend of the bottomv of the sifter.

winding of the dough around said shafts,

. which is frequently the case in dough mixers now in common use. Bypreventing the dough from adhering to and winding about the shafts it isobvious that a more thorough mixture of the dough is secured, since theblades of one shaft in moving upward past the opposite shaftlift thedough out of the liquid and drag it away from the shaft and carry it-upinto the air chamber, where it is drawn apart by the now separatingblades.

The mixing blades are so arranged that the end ones on both shafts, nextto the ends of thebasin, operate in the same plane so as to mix thedough clear to the end of the basin on either side. For this reason theshafts must be properly associated, that is geared relatively, so thatthese blades shall not interfere with one another. As these shafts arefrequently removed from the bearings, it is desirable to provide meanswhereby the inexperienced can and must replace them.

Trigo'rder that the two gear wheels 8 and 9, which are cast integralwith the shafts el. and 5 respectively, may always be so meshed as toallow these extreme end knives to pass one another, that is withoutinterfering with one another, I have provided a projecting rim 11 on thegear wheel 9 upon which the winch is cast, with a notch in it preferablyof the width of two teeth in the gear wheel. ()n the side of wheel 8, Iprovide a projection 12, two teeth in width, extending beyond the lengthof the teeth so as to enter into the notch previously described, wherebywhen the wheels are properly meshed the projection 12 will enter theopening in the rim ll of wheel 9. Thus it will be seen that only whenthe wheels are meshed in the proper relative positions, rim 11 andprojection 12 will not interfere. in any other relative positions .ofsaid gears, the projection 12 will strike rim 11 and iii-- terfere withthe operation of the machine, thereby warning the operator that themwchine is not properl assembled.

The ournal boxes and the shafts rotating thereii'i are constructed andproportioned relatively so as to prevent improper assemblingofjthevarious parts, and so as to reinforcehthe operativeqparts approximatethe point'of greatest strain, and so as to prevent the leak ofmaterialbetween .said shafts and surrounding.journal boxes as will bemore particularly described below.

The air chamber member 2 is provided with outwardly projecting lugs 28which in turn are provided with downwardly proj ecting lugs 40 (seeFigs. 1, 6, 10 and 17) to emproperly ing upon the air chamber.

brace the upper margin of the basin member 1, to sccure perfectadjustment of said two members and to prevent end movement. thereof.These lugs ell) project bilow the basin joint and beyond lhelinethereof, so that they lap down over the basin under the lugs 28, wherebythey are hidden from view. The faces of lugs -10 which engage with thebasin, are chilled and are thus made to lit accurately withoutadditional machine work, and. without. interfering with the chilling olthe contacting surfaces of the chambers. The upper edge of chamber 1 andthe lower edge of chamber 2 which come into engage ment with each other,are cast with chilled surfaces to secure a substantially tight,nonleakable joint between said two chambers, without further planing ornuichine work. Improved spring catches are also provided to maintainellicienl engagement between said basin member 1 and air chamber meanber52, which catches shall luu'einal'lcr be described in detail.

The top of air chamber 2 is open, and adapted to receive the sifterhopper 3. This sifter hopper 3 is a separate chamber readily removablefrom the top of the air chamber It is provided with flanges 21 at eachend loembrace the ends of air chamber 2 and to prevent endwise movement.Those flanges 21 also serve as supporting leelv for the siftcr hopperwhen the same not restbpring calchcs are also provided to lock thesiitcr member upon the air chamber member in thc opcralive position.Sifter hopper C5 is provided with the perforated bottom 32. The shall iis journalcd in the opposite ends oil said sil'lcr hopper. Theoscillating yoke or mix ing member lei: has an intermediate horizontal.extension with its two ends at right angles therewith; said ends beingmovable in transverse slots in shaft 18 the angles of the yoke or mixingmember between ilic vertical parts and the intermediate horizontal partare squared out, as shown in Fig. 1-1, so as to insure the dislodgmentof' the llonr close to the head of the siflcr hopper. Shall 13 isconnected by crank 15 and connecting rod 16 with the gear 8 whereby anoscillating movement is given thereto, causing the sitter yoke to sweepwith oscillatory movement the perforated curved bottom 32 of the siflerhopper El. The connecting rod 16 is provided at each end with theapert'irc 25$) for receiving the wrist pin of crank 15 and the wrist pinon gear wheel 8. Secured to the edge of the connecting rod 16 is thegravity actuated gate 4-1, provided with the slot through which passesthe screw 37. The wings or projections 41 extend on either side ol therod 16, and form a channel therefor. At the lower end of the gate ll isthe horizontal projection or lug These gates are of metal and have afree movement, with reill) lllil spect to the connecting rod 16, limitedby the extent of slot 38 through which screw 37 passes. In engaging therod with the wrist pins it is simply necessary to place the edge of theconnectingrod against the wrist pin and slide it downward. lVhen thewrist pin *of shaft 13 are provided the semi-circular projections 17which serve as bearings for takin the end thrust of the Sifter shaft 13,

and a so the side thrustof the yoke or mixing member 14. The pressure ofprojection 17 on the side of yoke or'mixingmember 14 forcesthe yoke downat the opposite end, so as to keep it in contact with theperforatedbottom of the sifterhopper. The shaft 13 base vibratory motionimparted to-it,

Qwhich causes it to move up and down in its journal boxes provided therebe any lost as 1 'boxes.

motion between said shaft and its journal This serves to pump the flourout through the journal boxes. To prevent this objectionable conditionI. provide at the oppositeend of the shaft from that to which the crankis secured, a journal box closed at its out-erend so that no leak ispossible there- -through. This structure is indicated at 18 in Figs. 1and 4.' Atthe crank end of the shaft I project the journalbox beyond theface of the sifter head and provide a recess 19 in the hub of the crankto receive said.

box, as indicated in Fig. 14 whereby the course of the flour is outthrough the box over the end of the box between it and the side of thecrank and'back over the box and within the recessed hub of the crank,thus making a clrcultous route for the flour to pass, this will servetotake up the leakage and practically prevent. the escape of the our.

Each head or end of the sifter hopper 3 has cast upon it two inwardlyprojecting lugs 20, opposite the feet 21, and which are adapted to restupon the upper curved edgeof the air chamber member 2. These lugs serveto maintain the sifter hopper 3 in its' proper position with respect tothe air chamber, up and down as well as SIClCWlSG.

' fllhe longer feet 21 extending downwardly over the outer ends of theair chamber pre-- vent endwise 'movement between hopper and air chamber.

The lugs 20 also serve to bring the perforated plate of the sifter toits exact position relative to the sifter heads, and to keep it 1nposition while soldering, there being recesses cut in the perforatedmetal to receive said lugs as shown in Fig.

16. The perforated bottom' 32, it will be seen, passes'benea'th the endsor heads of the si-fter hopper, the perforations extending the strain inturning the crank,

entire length of said hopper, so that the flour will be sifted to theextreme ends of .the mixing chamber. The upper end of the air chamberupon which rests the sifting chamber is bent outwardly so as to catchany flour that would otherwise lodge upon theupper edge of said airstraight. 1

The spring cat ch used to lock the various parts ofthe machine togetherhas the following novel features of construction. As these catches areall similarly constructed, a description of one will sufiice for all.

Referring to Figs. 6 and 17 the U-shaped spring 25 is pivotally securedby pivot 30 to a fixed lug on one of the members of the machine, say thebasin member 1. The other end of-the spring 25 is secured by pivot 29 toacam member 24 provided at its upper'end with a ring 52 for conveniencein chamber, were it manual operation. Cam member 24 is also providedwith a projecting point 26 and a projecting horn 27.

Referring to Fig. 17 member 24 is thrown into what may be termed apreliminary locking position. When member 24 is lifted upwardly towardlug 28 of member 2, the

projecting horn 27 encounters lug 28, until the projecting point 26,engages the upper side of said lug 28. The further tilting movement ofmember 24 causes the throwing of said member24 over the center, that is,

over the line of strain between said pivots 29 and 30 with respccttopoint 26, in the position, shown in Fig. 6. The horn 27 is at the sametime carried away free from engagement with lug 28. The ring 52 willrestjagainst the vertical wall of member 2.

.By this construction it will be seen that there is no rubbing orfriction between point 26 and lug 28, and therefore'no possibility ofwear which is. so often an objection to spring catches of this generalcharacter. It is obvious that when the member 24 is thrown over thecenter as above described, it will remain in such by the tension ofspring 25, until said member 24 is again manually operated to move inthe opposite direction over the center into the unlatcliing position.The side projections 24 on member 24 are adapted to encounter thesprings 25 to prevent the member 24 from upsetting or falling too farback. lVithout this it the born 27 to miss the lug 28 in bringing thecatch to the closed position.

On the near end and on the near side of the air chamber 2 is providedthe handle 53 would be possible forv position, being so held for thepurpose of enabling the operator to steadv the machineon the table whileoperating it, and l d take the reaction of the whereby not but theoperonly is the machine steadied by the action and reaction atorsteadied also,

of force required to -work the", machine.

This handle is secured by a bracket 54 cast upon the near head of theair chamber ex tending out far enough to receive the end of thehandlewhich handle is far enough from the side or" the air chamber to admit.of the hand going between the handle and the air chamber. The other endof the handle is supported by a small 1) 'acket secured to the side ofthe air chamber near the middle thereof as shown in Fig. 1.

To prevent leakage around the journals of the mixing shafts I close theouter end of the boxes opposite the gearing on the shaft, by placingover the end thereof a cireular plate, one-halt oi which is preferablyformed integrally with the basin member the other half with the airchamber member. so that when the two are brought together the opening isentirely closed. These closed journal boxes are'indicated by thenumerals 5G and 57 on Fig.3. I To 'irevent the endwise slip of theshafts in their journal boxes T provide the collars 5S and 59 inside thechamber at the. end approximate the gearing, as shown in Fig. 3, andalso in Fig. 18. These collars also serve to prevent the moisture anddough from working out through the journal boxes atthe gear ends of theshafts.

I provide the following improved means for securing a thermometer to thebasin member so that the same may be properly calib 'ated whether themercury stands normally below or above the position i have indicated asrequired for bread making. This thermometer 33 is secured in the recessformed by the surrounding flange 35. see Fig. 11. l provide a piece 0tsheet metal it see Fig. 12, having a vcrti ally extending portion,provided with series of holes 17 to receive the hook oi the thermtmictcrtube. 33. From the vertically extending portion of piece 46 extend apair of horizontal arms 48 adapted to wrap around the thermometer tubeonce and then engage in suitable apertures or recesses in the flange 35.

cure the thermometer tube to piece '1-0. The strip 3%; engaging insuitable rcce. es or apertures in flange 35 serves to maintain the lowerend of the thermometer tube in position. The range of temperature withinwhich the yeast plant will best develop shown by the indicatitm marks941 b, and ,l, see Fig. 11. The series ot'holes 47 afl'oi'dv means forshifting the position of the thermometer tube vertically with respect tothe indication marks on the basin, in calibrating. v

The basin member 1 is provided with the supporting legs 13 having treads415 which have the characteristic of being slightly elastic, heat:resisting, impervious to water and nondeteriorating with age, and whichshall produce a frictional contact with the table A second set of,shorter arms 19am provided to further seupon which the machine may rest.After a careful study of such substances as I was familiar with, andmany experiments among which were rubber bumpers, wooden bump ers,asbestos bumpers, fiber and rubber bumpers, I found by many teststhatcommon cork came the nearest to fillin all. the requirements. It iselastic, it is comparatively impervious to water, it resists a highertemperature than many of the other materials enumerated, without beinginjured. It does not shrink or otherwise deteriorate with age, and yetotters a frictional resistance to the table, thus fulfilling all therequirements. This cork is attached to the foot by casting a dovetailedcircular recess 44 in the body of the foot, and compressing therein corktreads 4-5 which are cut conically, compressed by a. machine, and forcedinto the recess, where the cork expands, filling the inner and largerend of same, and projecting out to form a cushion tread for the foot. Ifind that this is a. very valuable improvement in making the machinesilent when set upon the table, and greatly steadying it in theoperation oiiturn- The operation of my device is as follows: Beforeassembling the various elements, the basin member 1 or liquid chamber issupplied with a suitable quantity of liquid such as water, milk andyeast. The various ele ments are then assembled and flour is supplied tositter hopper 23. The handle 10 is turned in the clockwise direction asindicated by the arrow in Fig. 10, this being the natural direction ofrotation. By turning the handle in the clockwise direction, the mixingblades are turned in the direction ind' rated by the arrows in Fig. 2.That is, the blades. in the lower position approach each other andseparate only'in the elevated position. Assuming that the liquid inbasin 1 stands at a level about half way between the top and bottom ofbasin 1, the blades (3 and. 7 will approach each other beneath the levelof the liquid, meeting at a point considerably below the surface-thereofand separating entirclyabove the surface of the lit uid in theatmosphere of air chamber 2. This insures an etiicient mixing of theflour with the liquid and by pulling it apart in the atmosphere abovethe liquid the same is thoroughl aerated in the atmosphere of the airchamber. Fresh air is being constantly supplied to air chan'lber 2through the open spaces between the sitting hopper 3 and the top of airchamber 2.

\Vhile the blades are being rotated as above described, motion iscommunicated from gear 8- to crank 15, to rock shaft 13 and siftcr bar14, so that the relation of inovementbetween sitter bar and mixingblades is always constant, that is, the faster the blades rotate thefaster the sifting bar oscillates, so that the faster the mixing takesplace the faster the flour fed to basin 1.

The; formation of the bottom of basin 1,

that is,the intermediately disposed ridge 1,

- togethen so that the blat es will carry the m1xin and aeration of sameupwardly out' of'the liquid and pull or shred it apart in the atmosphereof air chamber EZ.

By providing the required predetermined quantities of liquid and flour,the thorough the dough is practic'a lly automatic, and always uniform.

the above described mechanism the flour; is sifted lightly andautomatically intipthe liquid. It is then" drawn ,lightly fitho'utmaterial pressure through the liqu vbythe mixing blades. It isthen lif e goutfof the liquid and pulled apart by the,iippositely movingmixing blades in ,the air chamber above the liquid and thereby aerated.By this operation the flour particles-are each completely enveloped inmoisture, and held in light contact with one another, so that they mayfully expandand develop. When the dough is sufliciently mixed, thevarious parts of the machine are separated, the shafts removed, and thedough clinging to the shafts and mixing blades is scraped back into thebasin 1. The lug l2,

proyided witlr a depression in its upper sur- 3 rac'eg" i s jaeonvenient means for supporting ond'eridbfhthe shaft while the operatorholdsi the {other end, during Lhe scraping operation. The dough thuscontained in the is then suitably covered and set aside, nan envelopingatmosphere .of proper temperature, indicated by the thermometer, untilsaiddough has sufficiently risen.

I tjlisgto be noted that the thermometer is clampedagainst the outsideof the metallic basin 1.. It is exposed to the outside atmosphere, thatis the atmosphere enveloping theysaid chamber. Being in contact With the"basin, the metal of which being a good conductor, it is distinctlyaffected by the temperature of the dough. It\ therefore serves toregister not the temperature of the enveloping atmosphere alone, northat of the, dough alone, but indicates rather the combined effect ofcontents of basin and. en-

velopingatmosphere, which enables the operatorto secure much moreuniform results.

What I. claim is 1. a dough rnixing'nmchine, the combination of a mixingvessel and mixing mechanism therein, said mixing mechanism comprising apair of parallel rotatable shafts provided with interdigitating mixingblades extending-nearly the distance between said shafts,-said bladesintegral with their supporting shafts and having their transverseextensions adjacent the shaft greater-than the shafts diameter and afilleted omder beand separate in the tween-blade and sliaft, as and posespecified.

2. In a dough mixing machine, the combination of a mixing vessel, a pairof cooperating mixing elements operating therein, said elementscomprising parallel shafts, each with radiating blades spirallyarranged, the blades having enlarged shoulders adjacent the supportingshaft and tapering toward the outer ends to facilitate carrying thedough upwardly and tearing it apart in the air.

3. In a dough mixing machine, the combi: nation of a liquid containingbasin, tyvo sets of mixing'blades operating therein, means for movingone set of blades toward the other beneath the liquid and for causingthe for the purmovement of one set away from the other.

above the liquid, means for sifting flour automatically into the liquid,the proportion, position and operation of the mixing blades being suchas to draw the flour 1i htly through the liquid and. then lift the'i'esutant dough out of the liquid and away fromthe blade actuating means andthen pull it apart in the air above.

4. In a dough mixing machine, the combination of a liquid containingbasin, a pair of parallel shafts, each provided with mixingblades widerat the shaft, than the diameter of the shaft, said width being in adirection transverse the axis of the shaft, and means for moving theshafts simultaneously so that the blades of one shaft will approach theblades of the other beneath the liquid,

air above the liquid.

5. In a ClOLI 'h. mixing machine, the combination of a liquid containingof parallel shafts,-each grovided with mixing blades set transverse theshaft end than the shaft diameter, means for moving the shaftssimultaneously so that the blades of one shaft will approach the bladesof the other beneath the li aid and separate in the air above theliquic, means for sifting flour into the liquid eontainin basin, andmeans for coupling the operation of the sifter and rotating shafts.

6. In a dough mixing machine, the combination of a pair of mixing shaftsprovided with mixing blades, the blades narrow in direction of the axesof the shafts and broad transversely and adjacent the shafts, andtapering thereto and therefrom, as and for the purpose specified.

- 7. In a dough mixing machine, the combination of a basin member and anair chainbasin, a pair y thereto Wider at ber member adapted tosuperimpose the;

basin member forming a single chamber, the

upper edge of the, basin and the lower edge of the air chamberwhichengage with each other, being cast with chilled surfaces. to form asubstantially tight nonleakable joint between said members, and lugsprojecting from one member to overlap the sides of the other member tosecure proper cooperation of said chilled surfaces.

8. In a dough mixing machine, the combination of a pair of mixing shaftsprovided with mixing blades, the blades narrow in direction of theaxesof the shafts and broad transversely and adjacent the shafts, andfilleted at'thc junction with the shafts.

9. In a dough mixing machine, the combi nation of a basin member, a pairof shafts having mixing blades, coiiperating gear wheels connected withsaid shafts, the jourpalcd portions of the shafts at the gear endsthereof having diameters greater than the diameters of the extension ofthe shafts between their journals.

10. In a dough mixing machine, the combination of a basin member and anair chamber member adapted to be disengageabl joined together to form asingle substantially non-lealrable chamber, a pair of shafts having"adially extending blades, split journal boxes for said shafts formedbetween the basin and air chamber members, said journal boxes closedabout the ends of the shafts at one end of the chamber, the shaftsprojecting through the journal boxes at the other end of the chamber,and provided with collars inte ral therewith adjacent the last mentionedournal boxes to prevent longitudial movement and also to preventleakage.

11. In a dough mixing machine, the combination of a basin member, a pairof shafts provided with mixing blades, journal boxes for said shafts,the shafts at one end and their corresponding journal boxes having adiameter less with respect to one, and greater with respect to theother, than the diam eter of the main portion of said shafts, to preventinterchanging of the shafts with respect to the journal boxes.

12. In a douglrmixing machine, the combination of a basin member, and anair chamber member disengageably connected together, one member providedwith lugs adjacent the other member, spring catches cooperating withsaid lugs for securing said members together, said catches comprising aspring pivotally secured to one of said members, a cam member pivotallysecured to the spring, said cam member provided with a projecting pointand a projecting horn approximate thereto, the said parts beingproportioned and associated so that the cam member shall have a springcontrolled, overthc-center frictionless engagement with its cotiperatinglu 13. In a dough mixing machine, the combination of a basin member, andan air chamber member disengageably connected toether, one memberprovided with lugs adjacent the other member, spring catches cooperatingwith said lugs for securing said members together, said catchescomprising 1'. spring pivotally secured to one of said members, a cammember pivotally secured to the spring, said cam member provided with aprojecting point and a projecting horn approximate thereto and a sideprojection for encountering the spring to prevent upset ting, the saidparts being proportioned and associated so that the cam member shallhave a spring controlled, over-the-center frictionless engagement withits cooperating in".

1st. in a dough mixing machine, the com bination of a basin member andmeans for. mixing the material therein, a sifter hopper for deliveringto the basin member having an oscillating yoke and a shaft for actuatingthe same,and projections on the heads of the hopper engaging the upperextensions of the yoke, as and for the purpose specified.

15. In a dough mixing machine, the combination of a mixing basin andmixing mechanism operating therein, a sitter hopper for delivering tothe basin, a sitter member in said hopper, having an internisdiatchorizontal extension and end eaten; sions at right angles thereto, ashaft for en.

engagu'ig said sifter member and operating.

the same, said shaft provided with apertures for receiving the endextensions of said sil'ter member and projections provided on the innersides of the hopper heads for engaging the ends of the Sifter memberabove the shaft for taking the side thrust of the sitter member.

it). In a dough mixing machine, the combination of a basin member and.Sifter hopper for delivering thereto, the sifter hopper comprising endmembers or heads, and a connecting sheet metal portion forming bottomand sides, the bottom part being perforated throughout its extension,and recessed at the ends, the heads provided at their lower sides withlugs for coiipcrating with the recesses in the perforated bottom tofacilitate in assembling said parts.

17. In a dough mixing machine, the combination of a basin member and asitter hopper for delivering thereto, the sitter hopper comprising endmembers or heads, and a connecting sheet metal portion forming bottomand sides, the bottom part being perforated throughout its extension,and rcccssed at the ends, the heads provided at their lower sides withlugs adapted to serve as supporting feet to said hoppen 19. in a doughmixing machine, the combination of a basin member, a pair of shafts withmixing blades operating therein, the endblade of each shaft traveling inthe same plane, gear wheels for causing the rotation of the shafts inopposite directions, and reccss and projection mains, connected with"aid gear wheels, for insuring their proper relative association.

19. In a dough mixing machine, the comteaser;

venting end movement with respect to thebasin member, springcatches fordisengage ably securing said two members together and a handle securedto the air chamber member to take the reaction of the strain themachine,

20. In a dough mixing machine, the combination of a mixing basin, mixingmechanism operating therein, a handle and elastic, non-deteriorating,heat resisting treads, associated with the basin and forming cooperatingmeans in connection. with the operator and the table supporting thebasin for steadying it and maintaining its position, during theoperation of the mixing lDfiClltlJllSl'il.

21. In a dough mixing machine, the combination of: a basin member, ahandle thereon, Winch operated mechanism for mixing dough in the basinand supporting feet for the basin member having cork treads as and forthe purpose specified.

22. In a dough mixing machine, the co1nbination oi? a basin member, anair chamber member disengageably connected therewith,

spring catches for securing said two members together, Winch operatedmechanism for mixing the dough in the basin, a handle soin operatingcured to the machine. to be grasped by the operator for taking thereaction of the straln 1n operatlng the Winch, and supporting feet forthe basin member havin cert: treads. I:

23. In a dough mining niiachinc having (-1ioperating crank shai ts,disengageable means for o ieratively comiecting the same, com 'niaing aconnecting rod recessed at each end and provided with gravity actuatedgates :tor closing the recesses, said provided with shoulders toencounter the wrist pins of the cranks when bringing the rod. intoposition.

24-. In a dough mixing machine, comprising a mixing chamber and siftinghopper reniovably related thereto, the sitting hopper having a crank shaand a sitting bar, the niirine chamber hzwing a JRILIC shaft and mixingbind (iisen auble means for opera tii ely eonn V i! hat comprising aconnectii .od r-ecesscd a each end and provided with wit :n-tnnted gates:tor closing the rccc s said gates provided with shoulders toii'nconnter the wris.v pins of the cranks when l'nringing the rod intoposition.

C fit-UK C-l i Ah l 13 E88, JR.

